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參數(shù)資料
| 型號： | LTC2420C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 2.5-V to 3.3-V/3.3-V To 5-V Level Shifting Transceiver With 3-State Outputs 48-TSSOP -40 to 85 |
| 中文描述： | 20位uPower在ADC的無延遲蘇- 8 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 186K |
| 代理商： | LTC2420C |
1
LTC2420
20-Bit
μ
Power
No Latency
Σ
TM
ADC in SO-8
January 2000
I
Weight Scales
I
Direct Temperature Measurement
I
Gas Analyzers
I
Strain-Gage Transducers
I
Instrumentation
I
Data Acquisition
I
Industrial Process Control
I
4-Digit DVMs
No Latency
Σ
is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
Total Unadjusted Error vs Output Code
10
V
CC
= 5V
V
REF
= 5V
T
A
= 25
°
C
F
O
= LOW
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
20-Bit ADC in SO-8 Package
I
8ppm INL, No Missing Codes at 20 Bits
I
4ppm Full-Scale Error
I
0.5ppm Offset
I
1.2ppm Noise
I
Digital Filter Settles in a Single Cycle. Each
Conversion Is Accurate, Even After an Input Step.
I
Internal Oscillator—No External Components
Required
I
Fast Mode: 16-Bit Noise, 12 Bits TUE at 100sps
I
110dB Min, 50Hz/60Hz Notch Filter
I
Reference Input Voltage: 0.1V to V
CC
I
Live Zero—Extended Input Range Accommodates
12.5% Overrange and Underrange
I
Single Supply 2.7V to 5.5V Operation
I
Low Supply Current (200
μ
A) and Auto Shutdown
I
Pin Compatible with 24-Bit LTC2400
APPLICATIU
The LTC
2420 is a micropower 20-bit A/D converter with
an integrated oscillator, 8ppm INL and 1.2ppm RMS
noise that operates from 2.7V to 5.5V. It uses delta-sigma
technology and provides a digital filter that settles in a
single cycle for multiplexed applications. Through a single
pin, the LTC2420 can be configured for better than 110dB
rejection at 50Hz or 60Hz
±
2%, or it can be driven by an
external oscillator for a user-defined rejection frequency
in the range 1Hz to 800Hz. The internal oscillator requires
no external frequency setting components.
The converter accepts any external reference voltage from
0.1V to V
CC
. With its extended input conversion range of
–12.5% V
REF
to 112.5% V
REF
, the LTC2420 smoothly
resolves the offset and overrange problems of preceding
sensors or signal conditioning circuits.
The LTC2420 communicates through a flexible 3-wire
digital interface which is compatible with SPI and
MICROWIRE
TM
protocols.
V
CC
F
O
V
REF
SCK
V
IN
SDO
1
2
3
4
8
7
6
5
GND
CS
REFERENCE
VOLTAGE
0.1V TO V
CC
ANALOG
INPUT RANGE
–0.12V
REF
TO 1.12V
REF
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
3-WIRE
SPI INTERFACE
1
μ
F
2.7V TO 5.5V
LTC2420
2420 TA01
V
CC
OUTPUT CODE (DECIMAL)
0
524,288
1,048,575
T
2420 TA02
8
6
4
2
0
–2
–4
–6
–8
–10
DESCRIPTIOU
FEATURES
TYPICAL APPLICATIO
U
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Final Electrical Specifications
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| LTC2420I | 16-Bit 2.5-V to 3.3-V/3.3-V To 5-V Level Shifting Transceiver With 3-State Outputs 48-TSSOP -40 to 85 |
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